1/*
  2 * Copyright (C) 2002-2003 Hewlett-Packard Co
  3 *	David Mosberger-Tang <davidm@hpl.hp.com>
  4 */
  5#ifndef _ASM_IA64_THREAD_INFO_H
  6#define _ASM_IA64_THREAD_INFO_H
  7
  8#ifndef ASM_OFFSETS_C
  9#include <asm/asm-offsets.h>
 10#endif
 11#include <asm/processor.h>
 12#include <asm/ptrace.h>
 13
 14#define PREEMPT_ACTIVE_BIT 30
 15#define PREEMPT_ACTIVE	(1 << PREEMPT_ACTIVE_BIT)
 16
 17#ifndef __ASSEMBLY__
 18
 19/*
 20 * On IA-64, we want to keep the task structure and kernel stack together, so they can be
 21 * mapped by a single TLB entry and so they can be addressed by the "current" pointer
 22 * without having to do pointer masking.
 23 */
 24struct thread_info {
 25	struct task_struct *task;	/* XXX not really needed, except for dup_task_struct() */
 26	struct exec_domain *exec_domain;/* execution domain */
 27	__u32 flags;			/* thread_info flags (see TIF_*) */
 28	__u32 cpu;			/* current CPU */
 29	__u32 last_cpu;			/* Last CPU thread ran on */
 30	__u32 status;			/* Thread synchronous flags */
 31	mm_segment_t addr_limit;	/* user-level address space limit */
 32	int preempt_count;		/* 0=premptable, <0=BUG; will also serve as bh-counter */
 33	struct restart_block restart_block;
 34#ifdef CONFIG_VIRT_CPU_ACCOUNTING
 35	__u64 ac_stamp;
 36	__u64 ac_leave;
 37	__u64 ac_stime;
 38	__u64 ac_utime;
 39#endif
 40};
 41
 42#define THREAD_SIZE			KERNEL_STACK_SIZE
 43
 44#define INIT_THREAD_INFO(tsk)			\
 45{						\
 46	.task		= &tsk,			\
 47	.exec_domain	= &default_exec_domain,	\
 48	.flags		= 0,			\
 49	.cpu		= 0,			\
 50	.addr_limit	= KERNEL_DS,		\
 51	.preempt_count	= INIT_PREEMPT_COUNT,	\
 52	.restart_block = {			\
 53		.fn = do_no_restart_syscall,	\
 54	},					\
 55}
 56
 57#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
 58
 59#ifndef ASM_OFFSETS_C
 60/* how to get the thread information struct from C */
 61#define current_thread_info()	((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
 62#define alloc_thread_info_node(tsk, node)	\
 63		((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
 64#define task_thread_info(tsk)	((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
 65#else
 66#define current_thread_info()	((struct thread_info *) 0)
 67#define alloc_thread_info_node(tsk, node)	((struct thread_info *) 0)
 68#define task_thread_info(tsk)	((struct thread_info *) 0)
 69#endif
 70#define free_thread_info(ti)	/* nothing */
 71#define task_stack_page(tsk)	((void *)(tsk))
 72
 73#define __HAVE_THREAD_FUNCTIONS
 74#ifdef CONFIG_VIRT_CPU_ACCOUNTING
 75#define setup_thread_stack(p, org)			\
 76	*task_thread_info(p) = *task_thread_info(org);	\
 77	task_thread_info(p)->ac_stime = 0;		\
 78	task_thread_info(p)->ac_utime = 0;		\
 79	task_thread_info(p)->task = (p);
 80#else
 81#define setup_thread_stack(p, org) \
 82	*task_thread_info(p) = *task_thread_info(org); \
 83	task_thread_info(p)->task = (p);
 84#endif
 85#define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
 86
 87#define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
 88#define alloc_task_struct_node(node)						\
 89({										\
 90	struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP,	\
 91					     KERNEL_STACK_SIZE_ORDER);		\
 92	struct task_struct *ret = page ? page_address(page) : NULL;		\
 93										\
 94	ret;									\
 95})
 96#define free_task_struct(tsk)	free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
 97
 98#endif /* !__ASSEMBLY */
 99
100/*
101 * thread information flags
102 * - these are process state flags that various assembly files may need to access
103 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
104 *   in top 16 bits
105 */
106#define TIF_SIGPENDING		0	/* signal pending */
107#define TIF_NEED_RESCHED	1	/* rescheduling necessary */
108#define TIF_SYSCALL_TRACE	2	/* syscall trace active */
109#define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
110#define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
111#define TIF_NOTIFY_RESUME	6	/* resumption notification requested */
112#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
113#define TIF_MEMDIE		17	/* is terminating due to OOM killer */
114#define TIF_MCA_INIT		18	/* this task is processing MCA or INIT */
115#define TIF_DB_DISABLED		19	/* debug trap disabled for fsyscall */
116#define TIF_FREEZE		20	/* is freezing for suspend */
117#define TIF_RESTORE_RSE		21	/* user RBS is newer than kernel RBS */
118
119#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
120#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
121#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
122#define _TIF_SYSCALL_TRACEAUDIT	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
123#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
124#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
125#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
126#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
127#define _TIF_MCA_INIT		(1 << TIF_MCA_INIT)
128#define _TIF_DB_DISABLED	(1 << TIF_DB_DISABLED)
129#define _TIF_FREEZE		(1 << TIF_FREEZE)
130#define _TIF_RESTORE_RSE	(1 << TIF_RESTORE_RSE)
131
132/* "work to do on user-return" bits */
133#define TIF_ALLWORK_MASK	(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
134				 _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
135/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
136#define TIF_WORK_MASK		(TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
137
138#define TS_POLLING		1 	/* true if in idle loop and not sleeping */
139#define TS_RESTORE_SIGMASK	2	/* restore signal mask in do_signal() */
140
141#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
142
143#ifndef __ASSEMBLY__
144#define HAVE_SET_RESTORE_SIGMASK	1
145static inline void set_restore_sigmask(void)
146{
147	struct thread_info *ti = current_thread_info();
148	ti->status |= TS_RESTORE_SIGMASK;
149	set_bit(TIF_SIGPENDING, &ti->flags);
150}
151#endif	/* !__ASSEMBLY__ */
152
153#endif /* _ASM_IA64_THREAD_INFO_H */